/* Lab Trial Test 2
* Name: Kokulananthan s/o Mohan
* Class: DEE1
* Date: 19/7/2024
*/

#include <WiFi.h>
#include <WiFiClient.h>
#include <PubSubClient.h>

char led_green = 18;
char led_green_state = LOW;
int led_green_interval = 750;
long led_green_previous_millis = 0;

int adc_interval = 1500;
long adc_previous_millis = 0;

const char* ssid = "Wokwi-GUEST";
const char* password = "";

const char* hostname = "broker.hivemq.com";

WiFiClient espClient;
PubSubClient client(espClient);
const char* espClientName = "esp32Client_Nathan"; // yourStudentID must be unique
int PORTNUM = 1883;

void setup_wifi()
{
  WiFi.begin(ssid, password);
  while(WiFi.status() != WL_CONNECTED )
  {
    delay(1000);
    Serial.print(".");
  }
  Serial.println();
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("Given IP by the router to ESP32 is ");
  Serial.println(WiFi.localIP());
}

void connectMQTT()
{
  while(!client.connected() )
  {
    Serial.println("Connecting to MQTT ...");
    if (client.connect(espClientName) ) //, mqttUser, mqttPassword) )
    {
      Serial.println("Connected");
      MQTTSubscribe();
    }
    else
    {
      Serial.print("Failed with state ");
      Serial.print(client.state() );
      delay(2000);
    }
  }
}

void MQTTSubscribe() 
{
}

void setup_MQTT() 
{
  client.setServer(hostname, PORTNUM);
}

void setup()
{
pinMode(led_green, OUTPUT);
Serial.begin(115200);

setup_wifi();
setup_MQTT();
}

void  loop()
{

  if ( !client.connected() )
  {
    connectMQTT();
  }
  client.loop();

long current_millis = millis();
// red LED
if (current_millis - led_green_previous_millis >= led_green_interval)
 {
   {
    led_green_previous_millis = current_millis;
    if (led_green_state == LOW)
      led_green_state = HIGH;
    else 
      led_green_state = LOW;
    digitalWrite(led_green, led_green_state);
   }
 }
  //adc
  if (current_millis - adc_previous_millis >= adc_interval)
  {
    adc_previous_millis = current_millis;
    int adc_val;
    adc_val = analogRead(A5);
  Serial.print("ADC = "); Serial.println(adc_val);
  
  char str[4];
    sprintf(str, "%d", adc_val);

  // have your own topic and publish str into the topic
    client.publish("Nathan/House/2706862N", str);
  }
}